Table 2.

Ethogram used to code subjects’ behaviors on each floor of the building, with description of each behavior.

Behavior	Description
Approach
Latency	Time (seconds) from elevator to door
Straight	Direct approach to door
Indirect	Indirect approach to door
Distraction	Person/item/sound diverts subject’s attention
Track	Sniffs floor while walking
Look at owner	Head directed toward the owner
At Door (arm’s length)
Sniff floor	Nose is pointed at the base of the door or doormat
Sniff door/landmark	Nose is pointed towards the door or the landmark
Move away	Walks away from the door within 10 s of approach